Angel number 644 means that you have a rightful place in at least two, but distinct, types of order. Each is an innate strength.
The reason I say this is because 644 is not a vector to be followed, (such as with an Inner number), but rather because it is an Outer number, itself, with at least two distinct orders. And, Outer numbers are reflections, or designs, of life patterns.
Numbers make it possible to see those patterns. (That’s why numbers are essential in science. Science requires observation, and numbers “is” that language of observation.)
Orders Of 644
644 belongs to the sequential order “23 times triangular numbers.”
I know. If you haven’t been exposed to sequential numbers, this may all sound a bit strange to you. So, here is the source so that you can observe, and verify, for yourself.
It is included in the sequence, “23 times triangular numbers,” designated in the On-line Encyclopedia of Integer Sequences, (OEIS), labeled (A195039), and can be accessed here: https://oeis.org/A195039.
Triangular numbers are also Outer numbers, in that they are described by their outer appearance because they form triangles.
Nevertheless, 644 is the eighth term of the (x23) sequence as follows: 0, 23, 69, 138, 230, 345, 483, 644, 828, 1035, 1265, 1518, 1794, …
644 is also a member of “7 times pentagonal numbers” as shown in OEIS (A152744) as the ninth term of the sequence, as follows: 0, 7, 35, 84, 154, 245, 357, 490, 644, 819, 1015, 1232, …
And, of course, pentagonal numbers are also figurate numbers, as they all describe the quantity of elements required to form the shape of a pentagon.
This is where the Sacred Geometries come from; but that’s quite a different subject.
But, as you will see next, it can get a lot deeper.
644 is also described as a “vertex number of a square spiral” of the Pythagorean triple [15, 8, 17], designated at the OEIS labeled (A195036), found here: https://oeis.org/A195036.
( In case you forgot, Pythagorean triples satisfy the equation a^2 +b^2 = c^2, that you learned in high school for right triangles. For example: 15^2 + 8^2 = 17^2)
Here, 644 is the 15th term of the sequence: 0, 15, 23, 53, 69, 114, 138, 198, 230, 305, 345, 435, 483, 588, 644, 764, 828, 963, …
Feel free to read the comments as to why these sequences are in an encyclopedia of sequences. You may notice that these in particular relate to the visible patterns that expose important numbers, like primes, for example, from a square spiral.
Relating Angel Number 644 To You
Why Is 644 Relevant To You?
Outer angel numbers, (figurate numbers and sequences, mostly), polygons, spirals, squares, cubes, pentagons, hexagons, and so forth, can be described by a shape! These shapes describe the design of the number or sequence as a visual.
And so, if you are seeing 644 as an angel number, (meaning, you are recognizing it often enough to stand out from other numbers consistently), then you should consider your standing as having a rightful place in at least two, but distinct, types of order.
Why Are You Seeing This Particular Number?
Angel number 644 is a reflection of none other than your self. (Most angel numbers are, but they are usually from the inside out. In this case, since angel number 644 is an objective, or Outer number, you are seeing the reflection from the outside in.)
In this sense, what you might notice about your life is that you are at the intersection of more than one order. See? Outer numbers often have a visual context that allows you to see order.
What Is Angel Number 644 Reflecting?
If this number reflects your dual position, (and only you can truly put your finger on what those are), it also means that you can influence more than one vector, or life direction, from your position.
You, in essence, have a personal power of influence in more than one direction. A lot of people are strong at something in particular. You, on the other hand, are strong at more than one thing in particular. (Only you know what those are.)
This is not to say that you should pick one direction. Quite the contrary. Given your position, you could just as easily pursue each life vector with great success, because they are EACH your strong suit.
For example: a person who is a chemist AND an electrical engineer, brings an awful lot to the table for either side. And do note, that it is often from the merging of divergent disciplines that bring about significant advancements, where others are incremental.
You may want to weigh-in on just what those strong suits entail. You have more than one strength. Find out what they are so you can create something truly powerful that only you can bring to the table. Don’t worry about how they relate to each other. Just find them.
You want to know what angel number 644 means to you personally? Find your strengths, and then discover, [the activity], where they intersect. Doing that creates a resonance, or a harmonic, that can carry you through successfully for a lifetime. That is the meaning of angel number 644. And that is how you follow this Outer spiritual vector.
The High Country